Ubuntu One is free file & folder syncing and sharing service using which you can share or sync files and folders across computers and other people that run Ubuntu Linux. This service run by Canonical which is the parent company behind Ubuntu Linux.

Features of Ubuntu One:

Seamless integration with your Ubuntu based computer

Sync files between multiple machines that run Ubuntu Linux.

Access to your files away from your computers via our web interface.

Share files with other Ubuntu users.

Work with your files remotely.

The are two plans that are available one is free plan which has got 2GB of storage and the other one is a paid plan that will cost you USD 10 per month.

This service is only available for Ubuntu Linux 9.04 (Jaunty Jackalope) and earlier Ubuntu versions are not supported. Currently this service in Beta phase hence the signups are the public, to get your invite go here and provide your Launchpad details to receive the invite.